Nursing care
Flail Chest nursing care: what to assess and what to do first
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Flail chest occurs when three or more adjacent ribs break in two or more places, creating a free-floating segment that moves opposite the rest of the chest wall during breathing. The nursing priority is pain control that allows deep breathing, not strapping or binding the chest, because restricting movement worsens hypoventilation and the risk of pneumonia.
The clinical picture
Flail chest results from blunt trauma severe enough to fracture three or more consecutive ribs in at least two places each, detaching a segment of the chest wall from the surrounding rib cage. That segment loses the structural support to move with the rest of the thorax, so during inspiration, when the chest wall normally expands outward, the flail segment is pulled inward by negative intrathoracic pressure. On expiration, it does the opposite, bulging outward while the rest of the chest falls.
This paradoxical movement is the defining sign and it is almost always visible, not something you have to auscultate for. It typically follows high-energy trauma such as a motor vehicle collision or a significant fall, and it frequently coexists with underlying pulmonary contusion, which is often the bigger driver of respiratory failure than the rib segment itself.
Assessment: what to look for and in what order
Look first, before you touch the chest. Expose it fully and watch a full respiratory cycle for the paradoxical inward-then-outward movement of the flail segment; this is often visible even through mild respiratory distress. Palpate gently for crepitus and point tenderness over the fracture sites, and note asymmetric chest wall movement even if a discrete flail segment is not yet obvious, since splinting from pain can mask paradoxical movement early on.
Auscultate breath sounds bilaterally, paying attention to diminished sounds over the injured side, which may indicate an underlying pulmonary contusion, haemothorax, or pneumothorax. Assess respiratory rate, depth, and effort, along with SpO2 and, where available, arterial blood gases, since hypoxaemia and hypercarbia can develop even when the visible injury looks stable. Check for associated injuries: flail chest from high-energy trauma rarely occurs alone, so assess for abdominal, spinal, and other thoracic injuries as part of the same primary survey.
Immediate interventions
Prioritise oxygenation and analgesia together. Administer supplemental oxygen to maintain SpO2 per order or protocol, and treat pain aggressively and early, since inadequate analgesia leads the patient to guard and take shallow breaths, which drives atelectasis and hypoxaemia far more than the mechanical instability of the flail segment itself. Opioid analgesia, and increasingly regional techniques such as an epidural or intercostal nerve block for more severe injuries, are used specifically to allow deep breathing and coughing.
Do not strap, bind, or apply external pressure to the flail segment in an attempt to stabilise it. This is an outdated practice that restricts chest wall movement, worsens hypoventilation, and increases the risk of atelectasis and pneumonia rather than preventing further injury. Position the patient to optimise breathing, typically semi-Fowler's or upright as tolerated, and prepare for the possibility of positive pressure ventilation, either non-invasive or via intubation, if respiratory failure develops despite pain control.
Ongoing nursing management
Reassess respiratory status frequently, including rate, depth, effort, SpO2 trends, and breath sounds, since deterioration from an evolving pulmonary contusion can occur over the first 24 to 48 hours even after initial stabilisation. Continue scheduled and as-needed analgesia rather than waiting for the patient to report severe pain, and reassess pain scores alongside respiratory effort, since under-treated pain is the direct pathway to hypoventilation here.
Encourage incentive spirometry and coughing exercises regularly while awake, splinting the chest with a pillow if needed to reduce discomfort during the effort. Monitor for signs of pneumonia, such as new fever, purulent secretions, or worsening infiltrates on chest imaging, since retained secretions from shallow breathing are the leading complication. Track fluid balance carefully if a pulmonary contusion is present, since aggressive fluid resuscitation can worsen pulmonary oedema in contused lung tissue.
Patient and family education
Explain to the patient why deep breathing and coughing matter even though it hurts, and reassure them that adequate pain relief is available and should be requested rather than endured. Teach splinting the chest with a pillow or folded blanket during coughing to reduce pain while still allowing an effective cough.
Set expectations about recovery timeline: rib fractures typically take four to six weeks to heal, and pain may persist for longer, particularly with movement or deep breathing. Advise the family that the chest wall may look visibly abnormal during breathing while the injury heals, and that this is expected rather than a sign of worsening. Reinforce that they should alert staff to any new fever, increased shortness of breath, or a change in sputum colour after discharge.
How this appears on the NCLEX
Expect flail chest questions to test recognition of paradoxical chest wall movement as the hallmark finding, often described as part of the assessment stem rather than named outright, requiring you to identify the mechanism from the description. Priority-setting items frequently present strapping or binding the chest as a tempting but incorrect distractor answer, testing whether you know that pain control and ventilatory support are the actual priorities.
Questions may also ask you to distinguish flail chest management from other chest trauma, or to select the priority action from a list including oxygen, analgesia, positioning, and chest tube insertion, where the correct sequence usually starts with airway and oxygenation, followed immediately by pain control to prevent hypoventilation. Watch for stems that describe a patient becoming increasingly hypoxic despite stable vital signs at rest, which points to an evolving pulmonary contusion rather than the rib injury alone.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our respiratory practice questions are the closest set to what this page covers.
Common questions
How many ribs need to be broken for flail chest?
Flail chest requires three or more adjacent ribs, each fractured in two or more separate places, creating a free-floating segment. A single or double rib fracture, even if painful, does not create the paradoxical movement that defines flail chest.
Why shouldn't you strap or bind a flail chest?
Strapping restricts chest wall expansion on the uninjured side as well as the flail segment, which worsens hypoventilation and increases the risk of atelectasis and pneumonia. Current practice favours pain control and ventilatory support so the patient can breathe deeply, rather than mechanically immobilising the chest wall.
What is the biggest complication risk with flail chest?
Underlying pulmonary contusion is usually the more dangerous injury, and it can worsen over the first one to two days even after the patient initially looks stable. Pneumonia from retained secretions due to shallow, pain-limited breathing is the other major risk, which is why analgesia and incentive spirometry are prioritised throughout care.
Does flail chest always require intubation?
No. Many patients are managed with aggressive pain control, supplemental oxygen, and pulmonary hygiene without intubation. Positive pressure ventilation, invasive or non-invasive, is reserved for those who develop respiratory failure despite these measures, often driven by the severity of an associated pulmonary contusion.